Weather-Rite XT112 Manual

NOT FOR RESIDENTIAL USE
CANADA: 100% OUTSIDE AIR ONLY
WARNING
Installation must be done by a contractor qualified
in the installation and service of gas-fired heating
equipment or your gas supplier.
Improper installation, adjustment, alteration, service
or maintenance can result in death, injury or
property damage. Read the Installation, Operation
and Service Manual thoroughly before installing or
servicing this equipment.
Installer
Please take the time to read and understand
these instructions prior to any installation.
Installer must give a copy of this manual to the owner.
Owner
Keep this manual in a safe place in order to provide
your service technician with necessary information.
Weather-Rite LLC
1100 Seven Mile Road NW
Comstock Park, MI 49321
Telephone: [phone]
Fax: [phone]
Toll Free: 800.589.3691
www.weather-rite.com
© 2017 Weather-Rite LLC
WARNING
FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. DO NOT try to light any appliance.
3. DO NOT use electrical switches.
4. DO NOT use any telephone in
your building.
5. Extinguish any open flame.
6. Leave the building.
7. Immediately call your local gas
supplier after leaving the building.
Follow the gas supplier’s
instructions.
8. If you cannot reach your gas
supplier, call the Fire Department.
Fire Hazard
Keep all flammable objects, liquids and
vapors the minimum required clear-
ances to combustibles away from
equipment.
Some objects will catch fire or explode
when placed close to equipment.
Failure to follow these instructions can
result in death, injury or property
damage.
Weather-Rite™XT-Series
Direct, Gas-Fired, Industrial
Air Handler
Installation, Operation &
Service Manual
XT112
XT115
XT118
XT125
XT130
P/N WR121100NA RevF 2/17

Conçus pour les applications non-résidentielles
Canada: seulement avec
100% d’air externe
ATTENTION
Linstallation doit être effectuée par un installateur
éprouvé/contractant qualifié dans linstallation et la
maintenance du syst me de chauffage par infrarouge
activé au gaz.
Linstallation, lajustement, laltération, le démarrage
ou lentretien inadéquat peuvent causer la mort, des
blessures ou des dégâts matériels. Lire enti rement
le manuel dinstallation, dopération et dentretien
avant linstallation ou l'entretien de cet équipement.
Installateur
Prenez le temps de lire et comprendre ces instructions
avant toute installation.
Linstallateur doit remettre au propriétaire
un exemplaire de ce manuel.
Propriétaire
Gardez ce manuel dans un endroit sûr pour
fournir des informations au réparateur
en cas de besoin.
Weather-Rite LLC
1100 Seven Mile Road NW
Comstock Park, MI 49321
Téléphone: +1.612.338.1401
Fax: [phone]
Numéro sans fraís: 800.589.3691
www.weather-rite.com
© 2017 Weather-Rite LLC
AVERTISSEMENT
POUR VOTRE SECURITE
Si vous sentez une odeur de gaz:
1. Ouvrir les fenêtres.
2. N’essayer pas d’allumer un appareil.
3. N’utiliser pas d’interrupteurs
électriques.
4. N’utiliser pas de téléphone dans votre
bâtiment.
5. Eteindre flamme nue.
6. Quitter le bâtiment.
7. Après avoir quitté le bâtiment, appelez
immédiatement votre fournisseur local
de gaz.
Suivre les instructions du fournisseur
de gaz.
8. Si vous ne pouvez pas joindre votre
fournisseur de gaz, appeler le service
d’incendie.
Risque d’incendie
Garder tous les objets, liquides ou vapeurs
inflammables à la distance minimale de
l’unité de chauffage requise avec les
matériaux combustibles.
Certains objets prendront feu ou exploseront
s’ils sont placés à proximité de l’unité de
chauffage.
Le non respect de ces instructions peut
entraîner la mort, des blessures corporelles
ou des dommages matériels.
Weather-Rite™XT-Series
L’appareil de traitment de l’air à
combustion directe, au gaz pour
les applications industrielles
Manuel d'installation,
d'opération,
et d'entretien
XT112
XT115
XT118
XT125
XT130
P/N WR121100FC RevF 2/17

TABLE OF CONTENTS
SECTION 1: Air Handler Safety..............................................1
1.1 Description of Operation...............................................1
1.2 Inspection and Setup ................................................... 1
1.3 Safety Labels and Their Placement .............................2
1.4 California Proposition 65 .............................................. 2
SECTION 2: Installer Responsibility ..................................... 3
2.1 Wall Tag ....................................................................... 3
2.2 Corrosive Chemicals.................................................... 3
2.3 National Standards and Applicable Codes .................. 4
2.4 Required Equipment .................................................... 4
SECTION 3: Critical Considerations ..................................... 5
3.1 Required Clearances to Combustibles......................... 5
3.2 Purge of Supply Duct ................................................... 6
3.3 Hardware ..................................................................... 6
SECTION 4: National Standards and Applicable Codes ..... 7
4.1 Gas Codes................................................................... 7
4.2 Installation Codes ........................................................7
4.3 Aircraft Hangars ........................................................... 7
4.4 Parking Structures and Repair Garages ...................... 7
4.5 Electrical ...................................................................... 7
4.6 Venting......................................................................... 7
4.7 High Altitude ................................................................ 7
SECTION 5: Specifications .................................................... 8
SECTION 6: Liftingan Air Handler ...................................... 10
6.1 Lifting an Air Handler ................................................. 10
SECTION 7: Roof Curb ......................................................... 12
7.1 Roof Curb Assembly and Installation ........................ 12
7.2 Air Handler Mounting to Roof Curb ........................... 14
SECTION 8: Legs For Horizontal Mounting........................ 15
8.1 Leg Mounting............................................................. 15
8.2 Leg Mounting - Horizontal Air Handler....................... 15
SECTION 9: Upright Installation .......................................... 16
9.1 Upright Leg Assembly................................................ 16
9.2 Upright Installation ..................................................... 16
9.3 Attaching Air Handler................................................. 16
SECTION 10: Filter Section .................................................. 21
10.1 Filter Section Support Assembly Installation (XT-115 -
XT-130).................................................................................... 21
10.2 Filter Section Installation - Horizontal Air Handlers .. 22
10.3 Filter Section Installation - Upright Air Handlers.......22
SECTION 11: Inlet Hood ....................................................... 23
11.1 Inlet Hood Assembly................................................. 23
SECTION 12: Dampers ........................................................ 30
12.1 Discharge Damper .................................................. 31
12.2 Inlet Damper ........................................................... 31
SECTION 13: Discharge Heads and Splash Plates............32
13.1 Three-Way Discharge Head Installation .................. 32
13.2 Splash Plate Installation........................................... 33
SECTION 14: Duct Considerations...................................... 35
14.1 Inlet Duct Work ........................................................ 35
14.2 Return Duct Work .................................................... 35
14.3 Discharge Duct Work ............................................... 35
SECTION 15: Gas Piping...................................................... 36
15.1 Gas Manifolds .......................................................... 36
15.2 Gas Piping and Pressures ....................................... 36
15.3 Gas Manifold Venting............................................... 36
15.4 Gas Piping ............................................................... 39
15.5 Pressure Test Ports .................................................. 39
15.6 Line Pressure Test - Leak Testing ............................39
SECTION 16: Electrical ......................................................... 40
16.1 Disconnect Fuse Sizing .......................................... 41
16.2 Wiring and Electrical Connections ........................... 41
16.3 Remote Panel .......................................................... 41
16.4 Motor Current Draw................................................. 41
16.5 Control Current Draw............................................... 42
16.6 Safety Systems........................................................ 42
16.7 Interlocks ................................................................. 45
16.8 Control Options........................................................ 45
SECTION 17: Sequence of Operation ................................. 47
17.1 Air Handler Configuration ......................................... 47
17.2 HVAC Remote Panels and Panel Options ................ 49
17.3 Basic Air Handler Sequence of Operation................ 51
SECTION 18: Direct Fired Burner ........................................ 55
18.1 Direct Fired Burner Ignition...................................... 56
18.2 Direct Fired Burner Flame Proving (Flame Rod)...... 57
SECTION 19: Direct fired process air heaters .................... 58
19.1 Direct Fired Process Air Heater Models................... 59
19.2 Installer's Responsibilities........................................ 59
19.3 Installer's Responsibility for Process Heaters Connected
to Paint Booths ....................................................................... 60
SECTION 20: Start-up Procedures ...................................... 61
20.1 Installation of Recirculating Air Handler................... 62
20.2 Mechanical .............................................................. 62
20.3 Electrical.................................................................. 63
20.4 Airflow...................................................................... 63
20.5 Gas Piping and Initial Pressure Settings.................. 64
20.6 Safety Shut Off Valve Check.................................... 66
20.7 Temperature Control System Calibration ................. 66
SECTION 21: Maintenance................................................... 69
21.1 General .................................................................... 70
21.2 Unit Exterior ............................................................. 70
21.3 Blower Section ........................................................ 70
21.4 Manifold and Controls .............................................. 73
21.5 Burner ..................................................................... 73
21.6 Optional Equipment ..................................................74
SECTION 22: Replacement Parts ........................................ 75
SECTION 23: Troubleshooting............................................ 79
23.1 Initial Checks ........................................................... 80
23.2 Motor and Blower ................................................... 80
23.3 Burner..................................................................... 81
23.4 Temperature Controls ............................................. 82
23.5 A1014 Amplifier - Field Checklist ............................ 83
23.6 A44 Amplifier - Field Service Checklist................... 85
SECTION 24: WEATHER-RITE™XT-Series Start-Up Proce-
dures...................................................................................... 87
SECTION 25: The WEATHER-RITE™XT-Series Warranty .. 89

© 2017 Weather-Rite LLC
Printed in
the U.S.A.

SECTION 1: AIR HANDLER SAFETY
1
SECTION 1: AIR HANDLER SAFETY
Yo ur Safety is Important to Us!
This symbol is used throughout
the manual to notify youof
possible fire, electrical or burn
hazards. Please pay special
attention when reading and
following the warnings in these
sections.
Installation, service and, at a minimum, annual
inspection of air handlers must be done by a
contractor qualified in the installation and service of
gas-fired heating equipment.
Read this manual carefully before installation,
operation or service of this equipment.
This air handler is designed for heating non-
residential indoor spaces. Do not install in residential
spaces. These instructions, the layout drawing, local
codes and ordinances and applicable standards that
apply to gas piping, electrical wiring, ventilation, etc.
must be thoroughly understood before proceeding
with the installation.
Protective gear is to be worn during installation,
operation and service in accordance to the
Occupational Safety and Health Administration
(OSHA). Gear must be in accordance to NFPA 70E,
latest revision when working with electrical
components. Thin sheet metal parts have sharp
edges. To prevent injury, the use of work gloves is
recommended.
Before installation, check that the local distribution
conditions, nature of gas and pressure and
adjustment of the appliance are compatible.
The equipment must be applied and operated under
the general concepts of reasonable use and installed
using the best building practices.
This piece of equipment is not intended for use by
persons (including children) with reduced physical,
sensory or mental capabilities, or lack of experience
and knowledge, unless they have been given
supervision or instruction concerning use of the
equipment by a person responsible for their safety.
Children should be supervised to ensure that they do
not play with the equipment.
For additional copies of the Installation, Operation
and Service Manual, please contact Weather-Rite
LLC.
Gas-fired equipment is not designed for use in
atmospheres containing flammable vapors or dust or
atmospheres containing chlorinated or halogenated
hydrocarbons. Recirculated room air may be
hazardous if containing flammable solids, liquids,
and gases; explosive materials; and/or substances
which may become toxic when exposed to heat (i.e.
refrigerants, aerosols, etc.).
1.1 Description of Operation
This air handler is a direct, gas-fired, fresh-air piece
of equipment. It is designed for indoor or outdoor
installation with fresh outdoor air delivered to the
burner. Air handlers are designed to operate in
temperatures as lowas -30° F (-34° C). The air
handler is factory-tested to fire with natural gas or
LPG (check the air handler's rating plate for
information on the appropriate gas). The burner
flame will modulate to maintain the selected
discharge air temperature or room air temperature,
depending on the selected controls. See Page 49,
Section 17.2. For maximum temperature rise, See
Page 66, Table 18.
The air handler may be provided with several
different controls and options to meet various
application requirements. Be sure to read this entire
manual before installation and start-up.
1.2 Inspection and Setup
The air handler is shipped fully assembled. The air
handler was inspected and operated prior to
shipment. Immediately upon receipt of the air
handler, check the fuel and electrical characteristics
of the air handler and verify that they match the fuel
and electrical supply available. Verify that the
specifications on the air handler rating plate match
the order. Check the air handler for any damage that
may have occurred during shipment. If any damage
is found, file a claim with the transporting agency. Do
not refuse shipment. Check the installation location
to ensure proper clearances to combustibles. See
Page 5, Section 3.1.
Any small options which do not come attached to the
air handler (i.e. remote panel) will be found inside the
air handler.
Larger accessories (i.e. legs, stand, filter section,
inlet hood) may either ship with the air handler or
separately. Check the bill of lading for information.
If the air handler must be temporarily stored (i.e. job
site is not ready for installation of the air handler), the
air handler should be set on 4" x 4" (10 cm x 10 cm)
pieces of timber on the ground in a protected area.
Cover the air handler to protect it from the
environment. Weather-Rite LLC will not be held
responsible for any damages that may occur from
outdoor storage.

SERIES XT INSTALLATION, OPERATION AND SERVICE MANUAL
2
1.3 Safety Labels and Their Placement
Product safety signs or labels should be replaced by
product user if they are no longer legible. Please
contact Weather-Rite LLC or your WEATHER-RITE™
independent distributor to obtain replacement signs
or labels.
1.4 California Proposition 65
In accordance with California Proposition 65 require-
ments, a warning label must be placed in a highly
visible location on the outside of the equipment (i.e.,
near equipment's serial plate). To order additional
labels, please contact Weather-Rite LLC or your
WEATHER-RITE™independent distributor.

SECTION 2: INSTALLER RESPONSIBILITY
3
SECTION 2: INSTALLER RESPONSIBILITY
The installer is responsible for the following:
• To install and commission the air handler, as well
as the gas and electrical supplies, in accordance
with applicable specifications and codes.
Weather-Rite LLC recommends the installer
contact a local building inspector or Fire Marshal
for guidance.
•Touse the information given in a layout drawing
and in the manual together with the cited codes
and regulations to perform the installation.
• To install the heater in accordance with the
clearances to combustibles.
•Tofurnish all needed materials not furnished as
standard equipment.
• To plan location of supports.
• To provide access to
air handler for servicing.
• To provide the owner with a copy of this
Installation, Operation and Service Manual.
• To never use heater as support for a ladder or
other access equipment and never hang or
suspend anything from heater.
•Toensure there is adequate air circulation around
the air handler and to supply air for combustion,
ventilation and distribution in accordance with
local codes.
• To assemble or install any accessories or
associated duct work using best building
practices.
• To properly size supports and hanging materials.
• To ensure heater is placed in an approved
application.
2.1 Wall Tag
A laminated wall tag is available for the heater as a
permanent reminder of the safety instructions and
the importance of the required clearances to
combustibles. Please contact Weather-Rite LLC or
your WEATHER-RITE™independent distributor to
obtain the wall tag. Affix the tag on a wall near the
heater (e.g. thermostat or control system).
A copy of the wall tag (P/N 91040118) is illustrated on
the back cover. For an immediate solution, youmay
affix this copy on the wall near the heater.
Knowyour model number and installed configuration.
Model number and installed configuration are found
on the rating plate and in the Installation, Operation
and Service Manual.
2.2 Corrosive Chemicals
Weather-Rite LLC cannot be responsible for ensuring
that all appropriate safety measures are undertaken
prior to installation; this is entirely the responsibility of
the installer. It is essential that the contractor, the
sub-contractor, or the owner identifies the presence
of combustible materials, corrosive chemicals or
halogenated hydrocarbons* anywhere in the
premises.
* HalogenatedHydrocarbons are a family of chemical
compounds characterized by the presence of halogen elements
(fluorine, chlorine, bromine, etc.). These compounds are
frequently used in refrigerants, cleaning agents, solvents, etc. If
these compounds enter the air supply of the burner, the life span
of the air handler components will be greatly reduced. The loca-
tion of the outside air supply must be carefully chosen to supply
outside air, free of these compounds, to the burners whenever
the presence of these compounds is suspect. Warranty will be
invalid if the air handler is exposed to halogenated hydrocar-
bons.
WARNING
Explosion Hazard
Equipment must have access to
uncontaminated air at all times.
Failure to follow these instructions can result
in death, injury or property damage.
CAUTION
Product Damage Hazard
Do not use equipment in area containing
corrosive chemicals.
Refer to appropriate Material Safety Data
Sheets (MSDS).
Failure to follow these instructions can result
in product damage.

SERIES XT INSTALLATION, OPERATION AND SERVICE MANUAL
4
2.3 National Standards and Applicable Codes
All equipment must be installed in accordance with
the latest revision of the applicable standards and
national codes. This refers also to the electric, gas
and venting installation. Note: Additional standards
for installation in public garages, aircraft hangars, etc.
may be applicable.
2.4 Required Equipment
When lifting of the equipment is required, the
installing contractor is responsible for supplying or
arranging for the appropriate lifting equipment so that
the air handler and accessories may be placed in a
safe manner.
The qualified installer or service technician is
responsible for having the appropriate equipment for
the safe installation and start-up of a direct-fired air
handler. Tools required to commission the equipment
include, but are not limited to, the following:
• Various screwdriver types and sizes
• Various adjustable wrenches
• Torque wrenches
• Pipe wrenches sized appropriately for the gas
train components
• Drill motor and various drills
• U-tube manometer or gas pressure gauge
• Volt meter
• Clamp style ammeter
• Belt tension gauge
• Caulk (non-silicone)

SECTION 3: CRITICAL C ONSIDERATIONS
5
SECTION 3: CRITICAL CONSIDERATIONS 3.1 Required Clearances to Combustibles
Clearances are the required distances that
combustible objects must be away from the air
handler to prevent fire hazards. Combustibles are
materials that may catch on fire and include common
items such as wood, paper, rubber, fabric, etc.
Maintain clearances to combustibles at all times
for safety.
Check the clearances on each air handler being
installed to make sure the product is suitable for your
application and the clearances are maintained.
Clearances to combustibles are 12" (30.5 cm) on the
control enclosure side and 6" (15.2 cm) on all other
surfaces. Read and followthe safety guidelines
below:
• Locate the air handler so that the air intakes are
not too close to any exhaust fan outlets, gasoline
storage, propane tanks or other contaminants that
could potentially cause dangerous situations.
• Keep gasoline or other combustible materials
including flammable objects, liquids, dust or
vapors away from this air handler or any other
piece of
equipment .
• Maintain clearances from heat sensitive material,
equipment and workstations.
Clearances to combustibles do not denote
clearances for accessibility. Minimum clearance for
access is 48" (122 cm). Minimum clearance for
accessibility applies to the control enclosure, blower
access panel and filter access panel (when
equipped).
The stated clearances to combustibles represent a
surface temperature of 90° F (50° C) above room
temperature (90° F [50° C] plus ambient
temperature). Building materials with a lowheat
tolerance (i.e. plastics, vinyl siding, canvas, tri-ply,
etc.) may be subject to degradation at lower
temperatures. It is the installer’s/owner’s
responsibility to assure that adjacent materials are
protected from degradation.
•Maintain clearances from vehicles parked belowthe
air handler. See Page 7, Section 4.4.
WARNING
Fire Hazard
Keep all flammable objects, liquids and
vapors the minimum required clearances to
combustibles away from equipment.
Some objects will catch fire or explode when
placed close to equipment.
Failure to follow these instructions can result
in death, injury or property damage.
WARNING
Explosion Hazard
Fresh air supply duct and burner housing
must be purged with fresh air four times
before every ignition.
Explosive vapors will ignite if not evacuated
before ignition attempt.
Failure to follow these instructions can result
in death, injury or property damage.

SERIES XT INSTALLATION, OPERATION AND SERVICE MANUAL
6
3.2 Purge of Supply Duct
If this heating unit is to be installed indoors, and its
outdoor air supply ducted from outdoors, ANSI
Standards Z83.4/CSA 3.7, Z83.18 and Z83.25/CSA
3.19 require that all supply duct shall be purged a
minimum of four times prior to any ignition attempt. If
the volume of the outdoor air supply duct exceeds
the heating unit’s ability to complete the required four
air changes prior to ignition, youmust contact the
factory to purchase an extended purge card of the
appropriate duration to meet this requirement.
3.3 Hardware
Unless otherwise specified, all hardware must be
torqued to settings on Page 6, Table 1.
Note: Inlet hood opening shall not be installed with
inlet opening facing into the prevailing wind direction
in order to help prevent the possibility of moisture
entrainment.
Table 1: Recommended Torque Settings
Bolt Head
Grade Marking
Nut Grade
Marking
Bolt Size Grade 2 Grade 5
10-24 27 in•lb 42 in•lb
1/4-20 65 in•lb 101 in•lb
5/16-18 11 ft•lb 17 ft•lb
3/8-16 19 ft•lb 30 ft•lb
Bolt Head
Grade Marking
Nut Grade
Marking
Bolt Size Grade 8.8Grade 10.9
M5 6Nm 9Nm
M6 10Nm 15Nm
M8 25Nm 35Nm
M10 50Nm 75Nm
M12 85Nm 130Nm
M16 215Nm 315Nm
8.8
10.9
8.8 10.9

SECTION 4: NATIONAL STANDARDS AND APPLICABLE CODES
7
SECTION 4: NATIONAL STANDARDS AND
APPLICABLE CODES
4.1 Gas Codes
The type of gas appearing on the nameplate
must be the type of gas used. Installation must
comply with national and local codes and
requirements of the local gas company.
United States: Refer to NFPA 54/ANSI Z223.1 -
latest revision, National Fuel Gas Code.
Canada: Refer to CSA B149.1- latest revision,
Natural Gas and Propane Installation Code.
4.2 Installation Codes
Installations must be made in accordance with
the Standard for the Installation of Air-
Conditioning and Ventilating Systems, NFPA
90A - latest revision for the installation of air
conditioning and ventilating systems.
4.3 Aircraft Hangars
Installation in aircraft hangars must be in
accordance with the following codes:
United States: Refer to Standard on Aircraft
Hangars, NFPA 409 - latest revision.
Canada: Refer to Natural Gas and Propane
Installation Code, Standard CSA B149.1 - latest
revision.
4.4 ParkingStructures and Repair Garages
Installation in garages must be in accordance
with the following codes:
United States: Refer to Standard for Parking
Structures, NFPA 88A - latest revision or the
Code for Motor Fuel Dispensing Facilities and
Repair Garages, NFPA 30A - latest revision.
Canada: Refer to Natural Gas and Propane
Installation Code, Standard CSA B149.1 - latest
revision.
4.5 Electrical
Electrical connection to air handler must be in
accordance with the following codes:
United States: Refer to National Electrical
Code®, NFPA 70 - latest revision. Wiring must
conform to the most current National Electrical
Code®, local ordinances, and any special
diagrams furnished.
Canada: Refer to Canadian Electrical Code,
CSA C22.1 Part 1 - latest revision.
4.6 Venting
The venting must be installed in accordance
with the requirements within this manual and
the following codes:
United States: Refer to NFPA 54/ANSI Z223.1-
latest revision, National Fuel Gas Code.
Canada: Refer to CSA B149.1 - latest revision,
Natural Gas and Propane Installation Code.
4.7 High Altitude
These air handlers are approved for
installations up to 2000' (609.6 m) (in the US)
and 4500' (1371.6 m) (in Canada) without
modification. Consult factory if US installation is
above 2000
' (609.6 m) or Canadian installation
is above 4500
' (1371.6 m).

SERIES XT INSTALLATION, OPERATION AND SERVICE MANUAL
8
SECTION 5: SPECIFICATIONS
Estimated weight table apply to both upright and
horizontal units of the same model. See Page 8,
Ta b l e 2 .
Unless otherwise requested, all direct-fired air
handlers are set-up to accept an external static
pressure (ESP) of 1 in wc (2.5 mbar). The external
static pressure is the sum of all accessories and any
attached ductwork. See Page 9, Table 4 and Table 5
for static pressure accessories. If more external static
pressure is required, this needs to be requested with
the order as required motor horsepower (HP) may
increase from the specifications given on Page 8,
Ta b l e 3 .
Table 2: Estimated ShippingWeights
* Includes Casing, Motor, Control Panel and Manifold
** Includes Weight of Filters
*** Total Quantity of 4 legs
**** Mounted to Intake Hood
Table 3: Performance
All information provided in this table is based on the assumption that unit is installed at an altitude below2000 feet (609.6 meters).
CF = Consult Factroy
** dBA is measured at 10' (3 m) from unducted discharge.
*** Maximum Inlet Gas Pressure:
Model XT-112 = 14 in wc (34.9 mbar)
Model XT-115-XT-130 = 5 psi (344.7 mbar)
Model XT-112 XT-115 XT-118XT-125 XT-130
lbs kglbs kglbs kglbs kglbs kg
Air Handler* 589 267 994 451 1290 585 1946 883 2877 1305
Filter Section** 118 54 210 95 282 128 407 185 439 199
Filtered Mix Box** 301 137 443 201 539 245 800 363 1156 524
Inlet Hoods 145 66 276 125 346 157 499 226 539 244
Upright Legs*** 75 34 99 45 137 62 176 80 214 97
Horizontal Legs*** 102 46 102 46 102 46 102 46 102 46
Moisture Limiters**** N/A N/A 120 54 120 54 210 95 260 118
Skid 147 67 249 113 324 146 486 220 719 326
Airflow
CFM (m3/h) Model
Motor HP at Noted External
Static Pressure (in wc)
dBA at Noted External
Static Pressure
(in wc)**
Heat Output at
Maximum
Temperature Rise
(Btu/h) x 1000
Minimum
Inlet Gas
Pressure
in wc
(mbar)***
Manifold
Size in NPT
(mm)
00.250.50 0.75 1.00 0 0.50 1.00 NG LPG
1,000 (1,700) XT-112 1111162 66 70 97 86 7.1 (17.6) 0.75 (19)
2,000 (3,400) XT-112 2222260 66 70 194 173 7.1 (17.6) 0.75 (19)
3,000 (5,100) XT-112 2222260 65 70 292 259 7.1 (17.6) 0.75 (19)
4,000 (6,800) XT-112 3 3 3 3 3 62 65 70 389 345 7.1 (17.6) 0.75 (19)
5,000 (8,500) XT-115 3 3 3 3 3 58 63 68 594 486 7.1 (17.6) 1.0 (25)
6,000 (10,200) XT-115 5 5 5 5 5 58 62 67 712 583 7.1 (17.6) 1.0 (25)
7,000 (11,900) XT-115 5 5 5 5 5 59 62 66 831 680 7.1 (17.6) 1.0 (25)
8,000 (13,600) XT-115 5 5 5 5 5 60 63 66 950 777 8.9 (22.1) 1.0 (25)
9,000 (15,300) XT-115 7.5 7.5 7.5 7.5 7.5 61 64 67 1,069 874 11 (27.3) 1.0 (25)
10,000 (17,000) XT-115 7.5 7.5 7.5 7.5 7.5 62 65 68 1,188 972 13.4 (33.3) 1.0 (25)
11,000 (18,700) XT-118 7.5 7.5 7.5 7.5 7.5 64 66 68 1,306 1,069 7.7 (19.2) 1.25 (32)
12,000 (20,400) XT-118 7.5 7.5 7.5 7.5 7.5 66 68 69 1,425 1,166 8.9 (22.1) 1.25 (32)
13,000 (22,100) XT-118 10 10 10 10 10 67 69 CF 1,544 1,263 10.3 (25.6) 1.25 (32)
14,000 (23,800) XT-118 10 10 10 10 10 69 CF CF 1,663 1,361 11.7 (29.1) 1.25 (32)
16,000 (27,200) XT-125 10 10 10 10 10 70 72 76 1,900 1,555 6.9 (17.2) 1.5 (38)
18,000 (30,600) XT-125 15 15 15 15 15 70 74 77 2,138 1,749 8.3 (20.6) 1.5 (38)
20,000 (34,000) XT-125 15 15 15 15 15 70 74 77 2,376 1,944 9.9 (24.6) 1.5 (38)
22,500 (38,200) XT-125 20 20 20 20 20 71 74 77 2,673 2,187 12.2 (30.3) 1.5 (38)
25,000 (42,500) XT-125 25 25 25 25 25 72 75 77 2,970 2,430 14.7 (36.6) 1.5 (38)
27,500 (46,700) XT-130 25 25 25 25 25 71 73 75 3,267 2,673 7.7 (19.2) 2.0 (51))
30,000 (51,000) XT-130 25 25 25 25 25 73 75 76 3,564 2,916 8.9 (22.1) 2.0 (51)
32,500 (55,200) XT-130 30 30 30 30 30 75 76 77 3,861 3,159 10.2 (25.4) 2.0 (51)
35,000 (59,500) XT-130 40 40 40 40 40 77 77 79 4,158 3,402 11.7 (29.1) 2.0 (51)
37,500 (63,700) XT-130 40 40 40 40 40 78 79 79 4,455 3,645 13.4 (33.3) 2.0 (51)
40,000 (68,000) XT-130 50 50 50 50 50 80 CF CF 4,752 3,888 15.2 (37.8) 2.0 (51)

SECTION 5: SPECIFICATIONS
9
Table 4: Estimated Pressure Drop of Accessory Components
Table 5: Estimated Pressure Drop of Accessory Components (continued)
Model Airflow Range Inlet Hood with Filters Filter Section Inlet Hood with
Moisture Limiters
Inlet Hood with
Bird Screen
in wc (mbar) in wc (mbar) in wc (mbar) in wc (mbar) in wc (mbar)
XT-112
1,000-
2,000
(1,700-
3,400) 0.25 0.62 0.25 0.62 - - 0.05 0.12
3,000-
4,000
(5,100-
6,800) 0.40 1.0 0.50 1.25 - - 0.05 0.12
XT-115
5,000-
6,000
(8,495-
10,200) 0.25 0.62 0.25 0.62 0.10 0.25 0.05 0.12
7,000-
10,000
(11,400-
17,000) 0.40 1.0 0.50 1.25 0.10 0.25 0.05 0.12
XT-118 11,000-
14,000
(18,700-
23,800) 0.40 1.0 0.50 1.25 0.10 0.25 0.05 0.12
XT-125
16,000-
17,000
(27,200-
28,883) 0.25 0.62 0.25 0.62 0.10 0.25 0.05 0.12
18,000-
25,000
(30,600-
42,500) 0.40 1.0 0.50 1.25 0.10 0.25 0.05 0.12
XT-130
27,500-
30,000
(46,772-
51,000) 0.35 0.87 0.75 1.87 0.10 0.25 0.05 0.12
32,500-
40,000
(55,200-
68,000) 0.40 1.0 0.85 2.12 0.10 0.25 0.05 0.12
Model Airflow RangeDischarge Heads Splash Plate Inlet/Discharge Damper
in wc (mbar) in wc (mbar) in wc (mbar) in wc (mbar)
XT-112
1,000-
2,000
(1,700-
3,400) 0.10 0.25 0.05 0.12 0.10 0.25
3,000-
4,000
(5,100-
6,800) 0.10 0.25 0.05 0.12 0.10 0.25
XT-115
5,000-
6,000
(8,495-
10,200) 0.10 0.25 0.05 0.12 0.10 0.25
7,000-
10,000
(11,400-
17,000) 0.10 0.25 0.05 0.12 0.10 0.25
XT-118 11,000-
14,000
(18,700-
23,800) 0.10 0.25 0.05 0.12 0.10 0.25
XT-125
16,000-
17,000
(27,200-
28,883) 0.10 0.25 0.05 0.12 0.10 0.25
18,000-
25,000
(30,600-
42,500) 0.10 0.25 0.05 0.12 0.10 0.25
XT-130
27,500-
30,000
(46,772-
51,000) 0.10 0.25 0.05 0.12 0.10 0.25
32,500-
40,000
(55,200-
68,000) 0.10 0.25 0.05 0.12 0.10 0.25

SERIES XT INSTALLATION, OPERATION AND SERVICE MANUAL
10
SECTION 6: LIFTING AN AIR HANDLER
The air handler must be installed in compliance with
all applicable codes. The qualified installer or service
technician must use best building practices when
installing the air handler and any optional equipment.
This piece of equipment requires at least 4 CFM (6.8
m3/h) of outside air per 1,000 Btu/h (0.293 kW). Any
air handler that recirculates air from the heated
space must use the return air opening to prevent any
return air from passing over the burner.
Before installation, check that the local distribution
condition, nature of gas and gas pressure, and the
current state of adjustment of the equipment are
compatible. If filters are not installed (via inlet hood or
filter section), an air strainer (provided by others)
must be installed on the inlet of the air handler with
openings less than or equal to 5/8" (16 mm) in
diameter. Air inlets must be installed in such a
manner that their lowest edge is 19" (500 mm) above
any surface. This applies to roof curbs, upright
stands and suspended air handlers.
6.1 Liftingan Air Handler
6.1.1 Preparingto Lift the Air Handler
Prior to lifting the air handler, the following steps must
be performed:
1. R e m o ve all packaging or banding that attached
the air handler to the skid and ensure that the
air handler is no longer bound to the skid.
2. Remove all of the accessories or packages that
were shipped on the same skid, inside the air
handler or inside the control enclosure.
3. Inspect the air handler to:
• Verify that there is no damage as a result of
shipping.
•Ensure that it is appropriately rated for the
utilities available at the installation site.
• Verify that the lifting lugs are intact
undamaged and secured to the air handler.
•Ensure factory-installed hardware is
torqued as specified.
4. Prepare the installation location to be ready to
accept the air handler (i.e. roof curb, mounting
stand or legs).
5. Verify the lifting equipment can handle the air
handlers weight and the required reach. See
Page 8, Table 2.
6.1.2 Liftinga Horizontal Air Handler (All Models)
Lift the air handler into place installing appropriate
hardware (supplied by others) into all lifting lug holes
on the unit base. For model XT-112, lifting lug holes
are 1.5" (3.81 cm) diameter. For models XT-115 - XT-
130, lifting lug holes are 2.0" (5.1 cm) diameter. Use
spreader bars to ensure that the lifting cables clear
the sides of the air handler. The air handler must be
kept level during the lift to prevent tipping, twisting or
falling. If lifted improperly, product damage may
occur.
Next, refer to the applicable portions of Section 7,
See Pages 12 - 14 for specific mounting instructions.
For mounting of accessories, refer to the applicable
portions of Page 21, Section 10.1 through Page 32,
Section 13.
FIGURE 1: Liftinga Horizontal Air Handler
WARNING
Crush Hazard
Use proper lifting equipment and practices.
Failure to follow these instructions can result
in death, injury or property damage.
Spreader Bar

SECTION 6: LIFTING AN AIR HANDLER
11
6.1.3 Liftingan Upright Air Handler
All air handlers are shipped in the horizontal position.
Prior to lifting an upright air handler, the following
steps must be performed (See Page 11, Figure 2):
Step 1: The air handler must be lifted using the two
lifting lugs on the top of the discharge end and the
two lifting lugs on the inlet end, using a spreader bar
across the long axis. Lift the air handler off the skid
and place it on a flat, clean, dry surface.
Step 2: Remove the lifting lugs on the inlet end of the
air handler and re-install hardware.
Step 3: Use all four lifting lugs on the discharge end
of the air handler to enable the air handler to be lifted
into the upright position.
Step 4: Lift the air handler into upright position.
Step 5: Next, refer to the applicable portions of Page
16, Section 9 for specific mounting instructions.
FIGURE 2: Liftingan Upright Air Handler
Step 1
Remove These
Lifting Lugs
Step 2
Step 3 Step 4
Spreader Bar
INLET
INLET
INLET
INLET

SERIES XT INSTALLATION, OPERATION AND SERVICE MANUAL
12
SECTION 7: ROOF CURB
Roof curbs are shipped unassembled and require field assembly.
NOTE: Before installation, verify that youhave the correct roof curb and that all required components are
present. If any are missing, contact your WEATHER-RITE™independent distributor.
7.1 Roof Curb Assembly and Installation
Assemble roof curb according to the assembly drawing, on Page 13, Figure 3. Supplied hardware must be
torqued to recommended specifications on Page 6, Table 1.
Place the curb on the roof in the position in which it will be installed. Check that the diagonal measurements
are within 1/8" (3 mm) of each other. To ensure a weatherproof seal between the air handler and the curb,
the curb must be level with no twist from end to end. Shim level as required and secure curb to roof deck
using best building practices. The curb is self-flashing. Install roofing material as required.
NOTE: Check the installation location to ensure proper clearances to combustibles and clearance for
access. See Page 5, Section 3.1.
Crush Hazard
Use proper lifting
equipment and
practices.
Falling Hazard
Use proper safety
equipment and prac-
tices to avoid falling.
Severe Injury Hazard
Use proper lifting
practices and equip-
ment.
Equipment and
accessories are
heavy.
Cut/Pinch Hazard
Wear protective gear
during installation,
operation and
service.
Edges are sharp.
WARNING
Failure to follow these instructions can result in death, injury or property damage.

SECTION 7: ROOF CURB
13
FIGURE 3: Roof Curb Assembly
NOTE:
*Blower and Burner Section
**Blower, Burner and Mixbox
*** Split sides and Cross Brace for Model XT-130
• Curb is shipped unassembled.
• A and B are outside dimensions for the top of the curb.
• Curb material is 14 gauge galvanized steel.
• Nuts and bolts (3/8" x 1") are furnished.
• Caulk all joints before assembling. (Caulk provided by others)
Caulk required for outside perimeter
of roof curbat bolted joints.
Top Mounting Flange
Side Panel
End Panel
(Inlet or Discharge)
***Side panels are split
***Cross Brace
Model Dimensions Weight* Weight**
ABCDElbskglbs kg
XT-112 (in) 24.3 80.2 21.3 128.1 48.9 96 43 140 63
(cm) 61.7 203.7 58.7 325.5 121.8
XT-115 (in) 39.3 105.1 36.3 155.5 51.4 133 60 179 81
(cm) 99.8 267.0 96.8 395.1 128.1
XT-118(in) 45.1 96.3 42.1 143.2 47.9 130 59 173 78
(cm) 114.6 244.6 111.6 363.8 119.2
XT-125 (in) 51.9 114.7 48.9 182.7 68.0 153 69 216 97
(cm) 131.8 291.3 128.8 464.1 172.7
XT-130 (in) 76.1 151.8 73.1 215.4 64.6 210 94 268 121
(cm) 193.3 385.6 190.3 547.1 161.5

SERIES XT INSTALLATION, OPERATION AND SERVICE MANUAL
14
7.2 Air Handler Mountingto Roof Curb
After the curb has been installed, the air handler may be placed on the curb. See Page 14, Figure 4. After the
air handler is in place, the installer must fasten the air handler to the curb. This is accomplished by drilling
holes down through the floor of the air handler and into the curb. At least three #12 sheet metal screws
(supplied by others) equally spaced on each side must be used to attach the air handler to the curb. After the
curb has been installed, the air handler may be placed on the curb. There must be a 1/8" (.3 cm) x 2" (5.1
cm) neoprene closed cell, adhesive-back gasket (supplied by others) between the top of the curb and the
base surface of the air handler to prevent moisture from leaking into the building from either driving rains or
melting snow. The installer is responsible for tying the air handler to the curb per all applicable codes.
FIGURE 4: Curb Mounting
Air Handler
Roof Curb
Fastening Detail